IP chain rule syntax Question/Problem

1. A Simple IP Chains rule question.

Hi groups.

I have a LAN setup like this.

1.) redhat linux 7.0 server running IP Chains. On this server there are 2
network cards, one connected to the internet with the IP address
217.34.194.x and one on the internal LAN with the IP address 10.11.216.x

I am also running squid for http proxy.

When my windows clients on the 10.11.216.x lan connect to chat.yahoo.co.uk I
get the webpage up and the login goes ok, but as the browser is loading the
chat room I get the error

Unable to connect to server try again in a few minutes.
The browser URL says

My IP Chains rules look like this

-A forward -s -j MASQ
-A input -s -d 0/0 -p tcp -y -j ACCEPT
-A input -s 0/0 -d -p tcp -y -j ACCEPT

What rule do I have to add to allow my 10.11.216.x clients to connect ???



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